Student Laptop Computers: Duplicate IP Numbers

Windows Directions     |     Macintosh Directions


The University assigns each student computer one (1) IP address (numerical IP address). Therefore, if your laptop computer has both an Ethernet adapter and a wireless network adapter, you will need to disable your wireless network adapter while using your (wired) Ethernet adapter.

Even though there are wireless access points in lounges and common areas of the residence halls, the University does not guarantee wireless coverage in individual residence hall rooms. Some residents can pick up a strong wireless signal in their rooms some of the time; however, most residents report that signal strength fades in and out. Therefore, we suggest disabling your computer's wireless card while you are using the Internet in your residence hall room.

Further, if your computer is connected via its (wired) Ethernet adapter and its wireless adapter also senses a nearby wireless access point, you will be unable to connect to the Internet. (Error: Duplicate IP Address)


Windows XP and Windows 2000 Instructions


Macintosh Instructions

MacOS X allows you to create an icon for AirPort (wireless) in the top menu bar on the computer screen.

  1. If your computer has an icon like this one in the top toolbar
    airport icon
    skip to step 3. (Some or all of the black lines may be grey depending on the strength of the wireless signal.)
  2. To make the AirPort icon visible,
    • open System Preferences (either from the system dock or from the Apple menu) and select Network,
    • select Airport,
    • select Configure,
    • place a checkmark in the box labelled Show AirPort status in menu bar, and
    • close the system preferences window.
  3. To disable the wireless card, click on the AirPort icon and select Turn AirPort Off. The lines indicating signal strength will disappear.
  4. To re-enable the wireless card, click on the AirPort icon and select Turn AirPort On.



IT Help Center
Last updated August 8, 2006
Copyright © 2005 University of Delaware